300 blackout C.O.L.

[Henri311]

Been loading 300 blackout with 150gr Sierra, trying something different bought 500 110gr Hornady RN fmj the book reads 2.05 col but the seating depth seems very slight. Does anyone else load these? What c.o.l. Is best? I researched online more and found a recipe for 1.85 and another for 1.90. I think I'll do some experimenting with 1.895 and see how that works.

 

[Henri311]

After test firing 1.85 col cycles and shoots fine for plinking which is my intent for these rounds.

 

[sold7]

Never heard of anyone using for a blackout round didn't think they would cycle in a AR

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